fix: remove targetClass from validation records

## Bump
- [ ] Major
- [ ] Minor
- [x] Patch

## Changelog

### Fixed
- Remove `targetClass` from `DataQualityValidationRecord` write paths — the property was added to the code in 81a09ba but the CDF container schema was never updated, causing all records with violations to fail with `Unknown property: dataQuality.DataQualityValidationRecord.targetClass`
